Supco DVTH Graphical Temperature & Humidity Data Logger

Overview

The Supco DVTH Graphical Temperature & Humidity Data Logger is a compact, self-contained environmental monitoring instrument engineered for continuous, high-fidelity recording of temperature and relative humidity in regulated and non-regulated environments. Based on capacitive polymer humidity sensing and precision thermistor-based temperature measurement, the DVTH operates under the principle of dual-sensor synchronous acquisition—ensuring correlated, time-stamped readings of both parameters at user-defined intervals. Its integrated graphical LCD enables real-time visualization of live values (temperature, RH, dew point), trend curves, alarm thresholds, memory status, and sampling configuration—eliminating dependency on external software during routine visual inspection. Designed for unattended operation over extended periods, the device supports up to 43,344 timestamped data points with automatic wraparound or stop-on-full memory behavior, making it suitable for validation studies, cold chain verification, archive preservation, and laboratory environmental qualification per ISO 14644-1, ASTM E2234, and WHO Technical Report Series No. 961 Annex 9.

Key Features

• Backlit graphical LCD display showing real-time temperature, relative humidity, calculated dew point, and dynamic trend plots with configurable upper/lower alarm limits
• User-programmable sampling interval from 1 second to 18 hours, supporting both high-resolution short-term profiling and long-duration stability monitoring
• On-device configuration via intuitive menu navigation: operator ID assignment, channel enable/disable, metric/imperial unit toggle, logging mode selection (continuous or triggered), single-point offset calibration, password-protected setup, and alarm setpoint definition
• USB-B interface for direct connection to Windows/macOS/Linux systems; no proprietary drivers required—data exports as CSV or XLSX via bundled SupcoLog software or generic file transfer
• NIST-traceable calibration certificate included; factory-calibrated against reference standards maintained under ISO/IEC 17025-accredited procedures
• Rugged ABS housing with IP54-rated ingress protection; operating temperature range of −10 °C to +65 °C and 0–99 %RH ensures reliability across refrigerated storage, ambient labs, and climate-controlled archives

Sample Compatibility & Compliance

The DVTH is not sample-contacting—it measures ambient air conditions only and requires unrestricted airflow around its integrated sensor module. It is compatible with static and low-velocity air environments typical of walk-in cold rooms, pharmaceutical refrigerators, museum display cases, and cleanroom buffer zones. The device complies with CE marking requirements (2014/30/EU EMC Directive and 2011/65/EU RoHS Directive) and meets essential performance criteria outlined in ISO 17025 for data integrity, including time-stamp accuracy (10 years at 25 °C), and audit-ready metadata (operator ID, start/stop timestamps, configuration hash). While not inherently 21 CFR Part 11 compliant out-of-the-box, its logged datasets support ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate) when used with validated SupcoLog software and organizational SOPs governing electronic records.

Software & Data Management

SupcoLog desktop application (Windows 10/11, macOS 12+, Linux Ubuntu 20.04 LTS) provides full configuration, real-time monitoring, and post-acquisition analysis. Users can generate annotated reports with customizable headers, statistical summaries (min/max/mean/stdev), overlay multiple sessions, export to PDF/CSV/XLSX, and apply linear interpolation for missing intervals. All exported files include embedded metadata: device serial number, firmware version, calibration date, operator ID, and cryptographic checksums. Audit trails are maintained locally per session and may be archived externally in accordance with GLP/GMP document retention policies. Raw binary logs are preserved in proprietary .DVTH format with optional encryption enabled via password-protected project files.

Applications

• Pharmaceutical cold chain monitoring: validation of vaccine transport containers, refrigerator/freezer mapping, and warehouse temperature uniformity studies
• Museum and library environmental stewardship: long-term tracking of dew point excursions to prevent hygroscopic degradation of artifacts and archival media
• Food safety compliance: HACCP-critical control point logging for chilled/frozen storage areas per FDA Food Code §3-501.12
• Academic and industrial lab environmental qualification: ISO/IEC 17025 clause 5.9 environmental condition documentation for testing facilities
• Building commissioning: baseline HVAC performance assessment and seasonal drift analysis in controlled environments

FAQ

Does the DVTH support external probe connectivity?
No—the DVTH integrates fixed-position temperature and humidity sensors only; it does not accept external or remote probes.
Can data be exported without SupcoLog software?
Yes—via USB mass-storage mode, the internal memory appears as a removable drive; CSV-formatted logs may be accessed directly using standard file managers.
Is battery life specified under continuous logging conditions?
At 1-minute sampling interval and default display brightness, typical battery life exceeds 12 months using two AA alkaline cells; low-power sleep mode extends longevity further.
How is traceability ensured for calibration records?
Each unit ships with a NIST-traceable calibration certificate listing uncertainty budgets per ISO/IEC 17025, reference standard IDs, environmental test conditions, and technician signature.
What happens when memory is full?
Users may select either “Stop Logging” or “Overwrite Oldest” behavior during initial setup; no data loss occurs unless explicitly configured for overwrite mode.